valediction

Definition of Valediction in English :

a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)

2. valediction

the act of saying farewell

WordNet Lexical Database for English. Princeton University. 2010.

Valediction

noun

1.

the act or an instance of saying goodbye

2.

any valedictory statement, speech, etc

noun

1.

the act of bidding or saying farewell

2.

something said in parting; farewell utterance

n.

1. An act of bidding farewell; a leave-taking.

2. A speech or statement made as a farewell.

3. A word or phrase of farewell used to end a letter or message.